//mu_lam = 4.485e-8*(exp(1/((-7.5907e-7*temp*temp)+(3.8968e-4*temp)+4.0130e-2))); (this is the formula which it has to solve if written in one line doesnt work so it has been broken down)//
}
return mu_lam6;
}

guys my question is

1. when i set the wall conditions at 25 and the temp of fluid at 45 and initialze. it should show me the prandtl number in btw these ranges, using the viscosity function u can calculate the viscosity at 25 and corresponding prandtl number which is viscosity dependent (pr range is from 1.3*10^4 (@25) to 1.4*10^5 (@45)) but it doesnt show the above values, i need some one to please tell me what's wrong.